For months, journalists and politicians fixated on the number of people signing up for health insurance through the federal exchange created as part of the Affordable Care Act. It turned out that more than 5 million people signed up using HealthCare.gov by April 19.

But perhaps more surprising is that, according to federal data released Wednesday to ProPublica, there have been nearly 1 million transactions on the exchange since then. People are allowed to sign up and switch plans after certain life events, such as job changes, moves, the birth of a baby, marriages and divorces.

The Hope Clinic in southwest Houston is in the very heart of Asia Town, a part of the city where bland strip malls hide culinary treasures — Vietnamese pho, Malaysian noodles, Sichuan rabbit and bubble tea.

Inside the clinic, internist Charu Sawhney sees patients from many countries and circumstances. She's a big believer in the Affordable Care Act since most of her patients have been uninsured. She actively pushed many of them to sign up for the new plans.

People are worried about being able to pay for health insurance. So the insurance industry and a group of Democratic senators have proposed offering cheaper, skimpier "copper plans" on the health law's marketplaces that could draw in people who were unhappy with the cost of available plans.

But consumer advocates and others who study the insurance market suggest that there may not be a big demand for these plans and that they could expose people to unacceptably high out-of-pocket costs if they got sick.